Frost line depth in Unicoi County, TN

How deep the ground freezes in Unicoi County, TN

16 in. Dig to 16 in, just below the frost. Nearest NOAA station: Erwin 1 W, 2.9 mi.

Your building department sets the legal frost line depth (IRC Table R301.2(1)); footings must go below it (R403.1.4.1). Call them before you dig.

Code depth · Snow